From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pg1-f199.google.com (mail-pg1-f199.google.com [209.85.215.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 76AC83AB5DA for ; Thu, 6 Aug 2026 01:11:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785978720; cv=none; b=omwhBu5/YOp1fBggSg8PoamPL8xo0CZZez9prNb3pe/wRf3FxmCAQJtdLUOhnRU7Ok9T53ZETm8xHxmEcUyz5f/djISlMIWfLmJafsPEgVaYCFxd0fDxDFQchgnkvqxfQ0toglsrMSbfpWzMTC3ciQozY0U7KLUBK6nw79AY5Ss= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785978720; c=relaxed/simple; bh=g4X1bLLZJWf+noFw4Ba/QxuDdXTsFijZGV55D7RQReE=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=VdhIDMnYo8tWIefstHNLG+pZ6roXoDEHmV4A4Clyi0hxf0KWBoEtYOPZjQuObTMp2Xz8alVZWGH0vBRDKjZi52PSJw31KANBFdpLA7yPKROMt9i1F/qDaquxRyWYIUaMmXfB5jcAFT0Ka0fR/e8G5fprHA/Dgz6XCySPg8M/EYg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--jyescas.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=DDhUHyPB; arc=none smtp.client-ip=209.85.215.199 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--jyescas.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="DDhUHyPB" Received: by mail-pg1-f199.google.com with SMTP id 41be03b00d2f7-cb4bd11ddf8so1707914a12.3 for ; Wed, 05 Aug 2026 18:11:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1785978719; x=1786583519; darn=vger.kernel.org; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:from:to:cc:subject:date:message-id:reply-to :content-type; bh=76HG6LbYfiqFkSfWGWloaRFtKjCX3Ei98IA8lOxBOao=; b=DDhUHyPBcI8MRw2dcTvOmoiZtdPb1cNpvLrpQ62ODh3i769fBaWSCQR89l+9Hc1E6R 0XssGq+GSe8WDOo08phNR/ZSZ0MIfi4nxS/wzVPEoc7gjgZvd5gh3QljNNdXq3cb98g1 voYXBf7MBDgfHU45omubZuMije3Xz17V9ylzLWAALpGQJuVJPUGxDm5n/1Rfzvi6ocMi C2I7KJeBjTJbGAuuJ9BXZbp+yk1ApMoU97j+iWJYm85AtMlh5zOonNL0M4TeUi6We46W DlkjOKTFRKXEJOAslas9NypD5UT6bHBPIFQw8Ed5ntyIoZms9GmButM4SRUJvbCWVp0D 3Osg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1785978719; x=1786583519; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=76HG6LbYfiqFkSfWGWloaRFtKjCX3Ei98IA8lOxBOao=; b=J8diMah1yRxiXCj8KpyMooxZieZndof6aUez3TrfoosmZ4XQ4jXbLqvNYpndcjGrH0 5A3wpTXJI9B93mvSaSqjBb7XyKD9L8I7rA+3uwZdVqqvosGUCqJ9hIU+t5fct2r4XuS4 IFot7Imigag7sipp8dbhk/g+M5wt3tYAU6Tu5aQR3u/WDg4YkazrpBhEKXNmx0mdkQ+x s/Ez/BlErj5iFnqX4h71UVxfFWd7sy6wmnZW5fxmSlzOYuh7m5+ocZohBJ6xYrtf9K3M MdebLrsN53Qm3gp3JElEjDvlXi3wl4hd6BBKQq9pRnLbpB8rdYVkbSUK79pW107yyQvL FZQQ== X-Forwarded-Encrypted: i=1; AHgh+RqdUzkF2JicprlvK6/ddHqO5V+UqiCocnNALnfyJ7n8OGOaLw0A4mf7sUIHN0VPTV6HIIcWR5mgz0t3hTA=@vger.kernel.org X-Gm-Message-State: AOJu0YzlsBqQMPF8m0Sg89Yp27gbV0y80sFzSmKrCRP2/RrvP/ZkrnOK Z9rmoRPfg3bUgfuixNEzq9yBNxwxjJroBbPbHdkEhTZlBT+GjLpbWyrfAs9cDg637YvxdV3jm/F ccDpC5IdNTQ== X-Received: from dltt12.prod.google.com ([2002:a05:701a:c96c:b0:13b:92c7:dcf7]) (user=jyescas job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a20:7f9a:b0:3c3:875d:c538 with SMTP id adf61e73a8af0-3cb85dbce51mr12099734637.8.1785978718458; Wed, 05 Aug 2026 18:11:58 -0700 (PDT) Date: Wed, 5 Aug 2026 18:09:05 -0700 In-Reply-To: <20260806011048.517229-1-jyescas@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260806011048.517229-1-jyescas@google.com> X-Mailer: git-send-email 2.55.0.629.g250fe7f194-goog Message-ID: <20260806011048.517229-5-jyescas@google.com> Subject: [RFC PATCH v2 04/16] mm: Define function to create a dir for each online node From: Juan Yescas To: Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , open list , "open list:MEMORY MANAGEMENT - CORE" Cc: jyescas@google.com, android-mm@google.com, ljs@kernel.org, fvdl@google.com, tkjos@google.com, minchan@google.com, dskiba@google.com, open list , "open list:MEMORY MANAGEMENT - CORE" Content-Type: text/plain; charset="UTF-8" This change creates a directory for each online node in the system. Signed-off-by: Juan Yescas --- Changes in v2: - Fix comments. - Use for_each_node_state(nid, N_MEMORY) instead. mm/page_alloc_hogger.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/mm/page_alloc_hogger.c b/mm/page_alloc_hogger.c index 175f479c487b..5765ecc43567 100644 --- a/mm/page_alloc_hogger.c +++ b/mm/page_alloc_hogger.c @@ -89,6 +89,7 @@ #include #include #include +#include #include #include @@ -125,6 +126,26 @@ struct page_alloc { static struct kmem_cache *req_alloc_cache; static struct kmem_cache *page_alloc_cache; +/** + * create_nodes_subdirs() - Creates a directory for each node that contains + * memory. + */ +static inline int create_nodes_subdirs(struct dentry *mmdir) +{ + struct dentry *nodedir; + int nid; + char dirname[12]; + + for_each_node_state(nid, N_MEMORY) { + snprintf(dirname, sizeof(dirname), "node-%d", nid); + nodedir = debugfs_create_dir(dirname, mmdir); + if (IS_ERR(nodedir)) + return PTR_ERR(nodedir); + } + + return 0; +} + static int __init page_alloc_hogger_debugfs_init(void) { int ret; @@ -154,8 +175,15 @@ static int __init page_alloc_hogger_debugfs_init(void) goto clean_page_alloc_cache; } + ret = create_nodes_subdirs(mmdir); + if (ret) + goto clean_dir; + return 0; +clean_dir: + debugfs_remove_recursive(mmdir); + clean_page_alloc_cache: kmem_cache_destroy(page_alloc_cache); -- 2.55.0.629.g250fe7f194-goog